" On this page I will try and describe what I know about End Fed Half Wave Length Antennas. I am always learning so you may see this page change from time to time as I learn more and correct errors. I don't expect anyone to take this information as gospel. I just hope that it helps others successfully use this type of antenna since it does have some unique advantages.
An End Fed Half Wave Length Antenna is a variation of the much more common half wave length dipole antenna. When an antenna that is one half wave length long has RF energy applied to it at its resonant frequency a standing wave develops on it. This standing wave consists of both current and voltage that are 90 degrees out of phase..."
(Steve Yates - AA5TB)